As i said, Mike Lockwood did it in 2004, using animals hypo animals born in 1996
You can read it here
http://tooscaley.com/reptiles/BrazilianRainbowBoas/Hypomelanistic Lineage.html
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Dave

Ive given up counting how many rainbows i have, but its enough to deplete my credit card every rodent order....
Im an aussie in an arctic environment
Helsinki, Finland